Direct measurements of triplet quantum yield of poly(3-dodecylthiophene) in solution
Abstract
-abstract- The photophysics, include radiative and non-radiative quantum yields and its decay rates, of regioregular poly(3-dodecylthiophene) (P3DT) in benzene were studied by means of a combination of ultraviolet-visible spectroscopy, photoluminescence spectroscopy, photothermal beam deflection calorimetry (PBD), photoacoustic calorimetry (PAC) and time-resolved photoluminescence spectroscopy. We observe the fluorescence quantum efficiency to be 0.30+/-b0.01 and the internal conversion (from S1 to S0) quantum yield of 0.59+/-b0.02 as well as the intersystem crossing (from S1 to T1) quantum yield of 0.11+/-b0.01. By measuring the fluorescence lifetime of ca. 490 ps, we estimate a radiative lifetime of 1.64 ns for the singlet excitons, and non-radiative decay rate constants of kic = 1.21 ns-1 and kisc = 0.22 ns-1 for internal conversion and intersystem crossing, respectively. The nature and photophysics of triplet states in poly(3-dodecylthiophene) is well characterized by using PBD and PAC, and the result suggests internal conversion play a major role in energy depletion. -/abstract-
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARZ30002H